Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 753 · 40 questions

The trick (Last digits only): Multiply (or add) only the last digits of the two numbers. The last digit of that result is the last digit the answer must have. Different last digit → wrong for sure. Same last digit → it passes the check (work it out in full to be certain).

1. 1.Last-digit check: is 992 + 962 = 1954 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 40 × 46 = 1840 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 75 × 42 = 3146 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 313 + 130 = 443 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 747 + 453 = 1200 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 235 + 184 = 418 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 983 + 580 = 1570 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 35 × 44 = 1543 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 20 × 74 = 1480 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 40 × 89 = 3562 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 39 × 78 = 3035 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 296 + 254 = 551 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 974 + 239 = 1218 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 26 × 22 = 572 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 28 × 80 = 2240 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 984 + 639 = 1617 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 70 × 50 = 3500 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 63 × 22 = 1378 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 63 × 53 = 3340 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 16 × 62 = 996 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 65 × 24 = 1551 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 912 + 680 = 1592 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 19 × 15 = 285 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 66 × 31 = 2047 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 78 × 74 = 5772 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 451 + 196 = 647 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 27 × 92 = 2484 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 65 × 59 = 3830 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 44 × 45 = 1980 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 21 × 24 = 504 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 271 + 417 = 693 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 507 + 236 = 743 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 333 + 200 = 526 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 76 × 85 = 6456 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 251 + 747 = 998 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 14 × 14 = 200 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 56 × 95 = 5320 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 743 + 575 = 1318 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 31 × 80 = 2488 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 84 × 55 = 4620 right or wrong? (a) Wrong (b) Right

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